Yes it can be over diagnosed like fibromyalgia. But having taught school and family members with disease am well aware of the behavior of a legitimate case. Picked it out on Z before I was aware it was public knowledge
I actually have a diagnosed case of fibromyalgia. I was in so much pain, it hurt to brush my teeth or put on clothes and I had to hold on to something to be able to walk.
A neurologist said that is what it was and gave me Amitriptyline and in three days I was outside washing my car. I now take two pills for fibro and a sleeping pill because I couldn't sleep, either, and I couldn't function without them.
It probably is over diagnosed, but not in my case. I was shocked to find out that is why I was such a mess.